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Convergence of Internal Tide Energy in deep water in the Suruga Trough

骏河海槽深水中内潮汐能的汇聚

基本信息

批准号：
07640570
负责人：
MATSUYAMA Masaji
金额：
$ 1.41万
依托单位：
Tokyo University of Fisheries
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640570/
关键词：
Internal Tides Internal Tides Energy Convergence of Energy Suruga Trough Izu Ridge Internal Kelvin Wave Level Model ADCP

项目摘要

Internal wave energy originated from a steep slope region can be incident in deep water under continuous stratification. In the previous study, we found the strong tidal currents above the sea bottom in the Suruga Trough, near the Suruga Bay head, and explained such phenomena to be associated with internal tides (Matsuyama et al.1993). The observed internal tides are possible to be generated at the northern part of the Izu Ridge and propagate on the sea bottom in the Suruga Trough. This study is performed to investigate a mechanism of energy concentrtion in deep water of the trough from the upper slope region such as the Izu Ridge and the Suruga Bay head by both the current measurements and numerical experiments. The current measurements were carried out on the northern part of the Izu Ridge and the slope region of the Suruga Bay head, two times, in fall of 1996 and summer of 1997. To obtain the vertical sections of the horizontal current, the repeated observations by ship were made cross the slope region by using ADCP (Acoustic Doppler Current Profiler) and XBT with the current and temperature measurements at moored station. The ADCP measurements show that the internal tide energy is a structure of a narrow beam near the shelf edge and is incident in the deep water from the slope region. The numerical experiment with three dimensional model shows the internal tide to be effectively generated on the northern part of the Izu Ridge and to be propagated into the Suruga Trough having internal Kelvin waves. The results in this study play a important role on study on propagation of the internal tide energy in deep regions.

源自陡坡区域的内波能可以在连续分层的深水中入射。在之前的研究中，我们在骏河湾头附近的骏河海槽海底发现了强烈的潮流，并将这种现象解释为与内潮有关（Matsuyama et al.1993）。观测到的内潮汐有可能在伊豆海岭北部产生，并在骏河海槽的海底传播。本研究旨在通过电流测量和数值实验来研究伊豆海岭和骏河湾头等上斜坡区域槽深水中的能量集中机制。 1996年秋季和1997年夏季，在伊豆海岭北部和骏河湾头斜坡区域进行了两次海流测量。为了获得水平海流的垂直剖面，船舶利用ADCP（声学多普勒海流剖面仪）和XBT在停泊站测量海流和温度，对斜坡区域进行重复观测。 ADCP测量表明，内潮能在陆架边缘附近呈窄梁结构，从斜坡区入射到深水中。三维模型的数值实验表明，内潮在伊豆海岭北部有效地产生，并传播到具有内开尔文波的骏河海槽。本研究结果对深部内潮能传播研究具有重要作用。